74676

Appears in sequences

• Numbers n such that 9*10^n + 5*R_n - 4 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=22A103100
• Twice partition numbers.at n=40A139582
• Even numbers k such that 6k+1, 12k+1, 18k+1, 36k+1 and 72k+1 are all primes.at n=18A206349
• Numbers k such that k and k^3 are sums of two twin primes.at n=22A213811
• Number of (n+1) X (1+1) 0..3 arrays with no element equal to all horizontal neighbors or equal to all vertical neighbors.at n=3A238518
• Number of (n+1)X(4+1) 0..3 arrays with no element equal to all horizontal neighbors or equal to all vertical neighbors.at n=0A238521
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no element equal to all horizontal neighbors or equal to all vertical neighbors.at n=6A238523
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with no element equal to all horizontal neighbors or equal to all vertical neighbors.at n=9A238523
• Numbers m such that 6m+1, 12m+1, 18m+1, 36m+1 and 72m+1 are all prime.at n=30A257035
• Irregular triangular array read by rows: T(n,k) is the number of non-isomorphic unlabeled weakly connected digraphs on n nodes and with k arcs.at n=64A283753
• Triangle read by rows: T(n,k) is the number of unlabeled weakly connected digraphs with n arcs and k vertices, k = 1..n+1.at n=51A350789
• Record values in A034058.at n=25A389568